For spot-checking oxygen concentrations, the MiniOX I Oxygen Analyzer is the preferred choice of healthcare professionals. This portable unit comes battery life indicators, an easy-to-use thumb wheel calibration dial, and a push-button ON/OFF switch. Powered by one 9-volt battery, the MiniOX I Oxygen Analyzer provides up to 1400 hours of use.  Each MiniOX I Oxygen Analyzer is shipped ready-to-use, complete with oxygen sensor, coiled cable, tee adapter, and battery.